The light is going to bounce off the window and the bouncing of light is called and reflection. So it will cause a reflection
You can always see your reflection in the window, just not as well during the day.The light coming in from outside makes it easier to focus your eyes past the window to your surroundings outside, instead of focusing on the reflection.
reflection
you can see your refection because the light bounces off the mirror into your eyes
Sun light hitting the atmosphere of the earth.
A mirror will always show your reflection, but a window won't always do that.
The light is going to bounce off the window and the bouncing of light is called and reflection. So it will cause a reflection
You can always see your reflection in the window, just not as well during the day.The light coming in from outside makes it easier to focus your eyes past the window to your surroundings outside, instead of focusing on the reflection.
The darkness outside provides a backdrop to allow your reflection to be seen easier.
reflection
Shade screens or heat insualtor window shades.
Is seeing his reflection in the glass.
The bird is seeing its reflection in the window of the glass and confuses its own reflection as a rival bird. The bird pecks the window in attempts to discourage "the rival" from invading its territory. This usually only happens in spring when territories are being re-established. The real question is "How do you stop the constant pecking of a bird on your window?" The short answer is to obscure the bird's reflection somehow like placing a bright light shining out from the other side of the window, or covering the outside of the window with a non-reflective material. The bird is probably landing on a nearby bush first, then spotting the reflection. So you could make the bush unpleasant to visit like a sprinkler aimed at it or foil strips? Perhaps the easiest solution is to find a picture of a really big bird of prey (the kind that eats your robin) and apply the cutout of that bird to the inside of the window.
reflection on general psychology
you can see your refection because the light bounces off the mirror into your eyes
The glass is clear, what you will paint is a window frame with a reflection or glare of light somewhere within the pane giving the suggestion that it is there, or whatever is on the other side of the window.
Stupid Robin!! He's attacking his own reflection in your window. Trying to drive off, what he believes is, an interloper into his territory. Anything to break up the reflection will cure his confusion. Strips of ribbon hung on the outside of the window work well. Duct tape works, but it's messy to remove. Strands of yarn hung outside. Good luck!!